I purchased a Lumber Jack from the first batch of kits. The instructions are quite clear and the engine is easily assembled. I have done a few modifications, added Regner's fill valve, headlamp, and modified the draw beams to accept Ozark miniature Couplers. I am now in possession of a Regner whistle kit but have yet to install it. I have also installed a Ronson type gas filler valve. When lighting the engine just after filling the gas tank it is prudent to listen carefully to make sure there is no liquid butane coming through the burner before lighting off. Listen carefully to hear the flame pop back to the burner. Regner warns against letting the fire burn in the smoke box. HEED THIS WARNING lest you find the cylinders sitting on the track under the engine after the retaining springs lose temper from overheating! No need to ask how I know this. Suggest you obtain some spare springs just in case. The engine is very docile and a real puller. This engine like the other engines in Regner's easy series is a good candidate for bashing, or modifying to put your creative mark on it.
Enjoy!
John Riley